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Surface modified mesoporous nanocast carbon as a catalyst for aqueous sulfide oxidation and adsorption of the produced polysulfides

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Abstract

In this work, a mesoporous nanocast carbon prepared using SBA-15 as a template was modified by surface oxidation to produce unique catalysts for sulfide oxidation/elimination from an aqueous medium. Different characterization techniques (BET, SEM, Raman, FTIR, potentiometric titration, elemental analyses, cyclic voltammetry) showed that treatment with concentrated HNO3 at 80 °C for 5, 15 and 30 min attacks the carbon structure creating different oxygen surface functionalities in concentrations varying from 0.4–1.1 mmol g−1 with a small effect on the surface area (1080–1148 m2 g−1) and pore volumes (micropore 0.17–0.20 cm3 g−1 and mesopores 0.36–0.50 cm3 g−1). These materials showed high activities for the oxidation of sulfide in an aqueous medium forming polysulfides, e.g., S22−, S32− and S42−, which are rapidly eliminated from the aqueous medium. These results are discussed regarding efficient sulfide oxidation at redox surface oxygen sites leading to the formation of higher polysulfides followed by adsorption of these relatively large and more hydrophobic molecules into the mesopores.

Graphical abstract: Surface modified mesoporous nanocast carbon as a catalyst for aqueous sulfide oxidation and adsorption of the produced polysulfides

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Publication details

The article was received on 23 Feb 2018, accepted on 05 Jun 2018 and first published on 08 Jun 2018


Article type: Paper
DOI: 10.1039/C8NJ00922H
Citation: New J. Chem., 2018, Advance Article
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    Surface modified mesoporous nanocast carbon as a catalyst for aqueous sulfide oxidation and adsorption of the produced polysulfides

    D. Barrera, F. G. de Mendonça, A. H. de Castro, J. P. de Mesquita, R. M. Lago and K. Sapag, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ00922H

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